package com.hubiao.pay.common.util;

import javax.servlet.http.HttpServletRequest;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class IPUtil {

    public static String getIpAddr(HttpServletRequest request) {

        String ip = request.getHeader( "x-forwarded-for" );
        if (ip != null && ip.length() != 0 && !"unknown".equalsIgnoreCase( ip )) {
            // 多次反向代理后会有多个ip值，第一个ip才是真实ip
            if (ip.indexOf( "," ) != -1) {
                ip = ip.split( "," )[0];
            }
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "Proxy-Client-IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "WL-Proxy-Client-IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "HTTP_CLIENT_IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "HTTP_X_FORWARDED_FOR" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getHeader( "X-Real-IP" );
        }
        if (ip == null || ip.length() == 0 || "unknown".equalsIgnoreCase( ip )) {
            ip = request.getRemoteAddr();
            if (ip.equals( "127.0.0.1" ) || ip.endsWith( "0:0:0:0:0:0:1" )) {
                // 根据网卡取本机配置的IP
                InetAddress inet = null;
                try {
                    inet = InetAddress.getLocalHost();
                } catch (UnknownHostException e) {
                    e.printStackTrace();
                }
                ip = inet.getHostAddress();
            }
        }
        return ip;
    }


}
